Pipe-coupling.



P. A. JOHNSON.

PIPE COUPLING. APPLiOATION FILED JAN. 12, 1909.

929,858. Patented Aug. 3, 19 09.

inarrnn STATES PATENT ornion.

PETER A. JOHilSON, OF LYLE, MINNESOTA.

PIPE-COUPLING.

Application filed-January 12, 1909. Serial No. 471,968.

To all whom it may concern:

lie it known that l, Pn'rni: A. JOHNSON, a citizen of the ll nitcdStates. residing at Lyle, in the county of Mower and State of Minnesota,have invented certain new and useful improvements in Pipe-Couplings, ofwhich the following is a specification.

This invention relates to pipe couplings, and more particularly tocoupling devices for connecting together sections of metallic pipes orcorrugated sections of culverts.

The object of my invention is to provide a fastening or coupling devicewhich may be quickly inserted and secured or locked in place on theoutside of a culvert or water main and without. the expense and timerequired for riveting together adjacent sections. I

The matter constituting my invention will he set forthin the clainis.

The details of donst'ruction and arrangement of parts are illustrated inthe accompanying drawings, in which- Figure 1 represents a perspectiveview of portions of. two connected pipe sections showing the couplingdevice in position. Fig. 2 represents a longitudinal section of portionsof connected corrugated pipe sections. shmving the coupling deviceinlocked position. Fig. 3 represents a similar section showing thecoupling device detached. ,i Figs. 4 and l represent, respectively, atop plan view and an edge view of a keeper. Fig. 5 represents an innerface view of portions of overlapped pipe sections. Figs. 6 and 7represent, respectively, side views of a modified form of key, one viewbeing at right angles to the other.

The culvert or pipe sections 1 and 2 may be made of corrugated metal inwhich the circumferential corrugations extend throughout the length ofeach section or in which each section is provided at its ends withoverlapped corrugations.

The end corrugations and 4 overlap one another as shown in Fig. 9 andeach of said corrugati0ns is provided, preferably in its contractedportion, with an elliptical or elongated opening 5 with its longestvaxis placed longitudinally or parallel with the axis of the culvert asindicated in Figs. 2, 3 and These elon gated openings are made in theoverlapping end corrugations at one or more points in the circumferenceand will be made at suitable intervals in the longitudinal lap-joint 15.in all cases the openings are preferably Specification of LettersPatent.

latented Aug. 3, 1909.

made in the contracted portions of the corrugations, as indicated inFig. 2.

For the purpose of quickly securing the end mrrugatio-us andlongitudinal lap-joints together 1 provide a key 6 having an upperelongated head 7 provided on its under side with downwardly projectingsharp edges or teeth 7* as shown in Fi In this fi ure s b t the key 7 isshown in position to he inserted into the opening .The key is made witha short shank which is provided with a lower elliptical or elongatedhead 8 at right angles to the head 7 and having upper 1 hearingshoulders 14. The head 8 is of the same shape as the opening 5 and of ato pass through it with a close fit. In connection with the key 6 I usea wedge shaped keeper ,or look device 9, consisting of an elongatedpiece of metal having a deep longitudinal slot 10 of the proper width toclosely engage the shank of the key. The upper surface of this keeperisniade with transverse notches 11 for receiving the sharp edges of theteeth 7 on the head of the key. The keeper or lock device 9 is madethicker atv its rear closed end and tapered toward the open end, asshown in Fig. 4:. The elliptical lower head 8 being passed through theopenings 5 in overlapped corrugations, the key will be given a onequarter turn so that the lower head will he turned across the openings5, as shown in Figs. 2 and 5, and then the wedge-shaped keeper piece 9will he pushed under the outer head 7 until the parts are closely drawntogether and the teeth 7* engaged in the notches 11. The keeper piece 9will rest in a concave portion of a corrugation and, on account of thespring in the overlapping metal, will he se curely held in place by theengaging teeth and notches. The keys and keepers can be very quicklyinserted from the outside of the culvert and are so engaged as tosecurely hold the overlapping corrugations or edges of the seamtogether. y

In modified form of key 6, shown in Figs.

6 and T, the outer head 7 may be square, and

through the elongated opening 5 so that the upper bearing shoulders 13will project slightly inward from the surface. Now by giving the key aone quarter turn the beveled faces 12 will readily slide over theconvexsurface of the metal until the shoulders bear firmly upon the mostinwardly curved coupling device are placed in the contracted portions ofthe corrugations they will be out of the way and protected fromaccidental derangement.

Having described my invention, what I claim as new and desire to secureby Letters Patent, is

1. A pipe coupling, comprising a key having a shank, an outer head, anelongated inner head with lateral projections at right angles to theouter head and a keeper device adapted to bear on the pipe below theouter head, substantially as described.

2. In a pipe coupling, the combination with overlapping corrugated partshaving elongated openings, of a key having an outer head and anelongated inner head adapted to be inserted through said openings andturned to engage and hold the parts together,whereby the pipe sectionsmay be coupled from the outside, substantially as described.

3. In a pipe coupling, the combination with overlapping corrugated partshaving across the corrugations, of a key having an outer head and anelongated inner head' adapted to be inserted through said openings andturned to engage and hold the parts to gether, whereby the pipe sectionsmay be coupled from the outside, substantially as described.

l. A coupling for corrugated pipe, comprising overlapping corrugationshaving transverse elongated openings, a key having an outer headprovided with downwardly projecting teeth, an elongated inner headadapted to be inserted'through said openings and turned at right anglesand a slotted keeper adapted to be pushed .under the outer head andengaged with its teeth for securely holding the parts together,substantially as described.

5. A coupling for corrugated pipe, comprising overlapping corrugationshaving transverse elongated openings in the contracted or inwardlycurved portions of the corrugations, a key having an outer head providedwith downwardly pro]ecting teeth, an elongated inner head to be insertedthrough said openings and turned at right angles and a slotted taperingkeeper havingtransverse notches and adapted to be pushed under the outerhead and engaged with its teeth for securely holding the parts together,substantially as described.

In testimony whereof I affix my signature, in presence of two witnesses.

PETER A. JOHNSQN.

Witnesses:

@Ln H. LINDEE, Geo. M. Annnason.

